Sunday's raid -- the first authorised by President Donald Trump -- saw US special operations forces enter the Yakla region of Baida province and target a compound occupied by Al-Qaeda in the Arabic Peninsula (AQAP) operatives.
Washington views the Al-Qaeda affiliate, known for plotting attacks in other countries, as the global terror network's most dangerous branch.
Navy SEAL Team Chief Special Warfare Operator William "Ryan" Owens, 36, was killed and three other US troops were wounded in a fierce gunfight.
And on Wednesday, the Pentagon acknowledged that several non-combatants, including children, had apparently been killed in the raid.
A Yemeni provincial official had previously said 16 civilians were killed -- eight women and eight children -- but the Pentagon did not provide numbers.
Washington is also facing questions on whether an eight-year-old American girl died. Local sources say the girl was the daughter of senior Al-Qaeda cleric and US citizen Anwar al-Awlaqi, killed in a 2011 US drone strike.
"When you think of the loss of life throughout America and institutions and in terms of the world, in terms of what some of the individuals could have done, I think it is a successful operation by all standards," Spicer said.
But he added it was hard to talk of success when an American was killed, and praised the sailor's sacrifice. He made no mention of the civilian victims.
Spicer said the plan had been under consideration since November 7, and officials under the administration of Barack Obama reviewed and approved it January 6, but did not proceed because they were waiting for a moonless night -- the next one wouldn't be until after Obama had left office.
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